Silvina Santana*, Berthold Lausen, Maria Bujnowska-Fedak, Catherine E Chronaki, Hans-Ulrich Prokosch and Rolf Wynn
* Corresponding author: Silvina Santana silvina.santana@ua.pt
BMC Family Practice 2011, 12:20 doi:10.1186/1471-2296-12-20